Buttonhole-sewing machine.



H. C. MILLER.

BUTTONHOLE SEWING MACHINE.

15 SHEETS-SHEET i.

v v o0 8 KuY n0 O* v 1 "lvl tummy H. c. MILLER. BUTTONHOLE SEWING MACHINE.

APPLICATION FILED MAR. 12, 1906.

Patented Oct. 24, 1911.

15 SHEETS-BHEET 2.

H. C. MILLER. BUTTONHOLB SEWING MACHINE. APPLICATION FILED HAB. 12, 1906.

Patented Oct. 24,1911.

' M, WM.

H. C. MILLER. BUTTONHOLB SEWING MACHINE.

' APPLIOATION FILED MAR. 12, 1906. 1,006,583. Patented 0015.24, 1911.

l' l 15 SHEETS-SHEET 4.

.marga wh/momo H. o. MILLER.

BUTTONHOLE SEWING MACHINE.

v y APPLIGATION FILED MARJZ, 1906. 1,006,583. Patented 0@1;.24,1911.

15 SHEETS-SHEET 6.

ttoflmm h H. c. MILLER. BUTTONHQLB SEWING MACHINE.

Patented 001;. 24, 1911.

NN m@ EN 15 SHEETS-SHEET 6.

APPLICATION FILED MAR. 12, 1906.

grill/l L uw fl NQN H. C. MILLER. BUTTONHOLE SEWING MAGHNB.

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11. o. MILLER. BUTTONHOLE SEWING MACHINE. APPLICATION IILED MAB.. 12, 1906.

' Patented 00.15.24, 1'9'11.

LOSS.

15 SHEETS-SHEET 8.

......--.w.. nu... w MW inventan Wikinews H. o. MILLER. BUTTONHOLB SEWING MACHINE.

APPLIOATION FILED MAB.. 12, 1906.

' Patented 0ct.24, 1911.

H. C. MILLER. BUTTONHLE SEWING MACHINE.

APPLICATION FILED MAB.. 12, 1906.

Patented 00.13.24:,1911.-

15 SHEETS-SHEET 10.

H. `G. MULLER. BUTTONHOLE SEWING MACHINE.

1L 1 9 1 Am, 2 lTul C 0v d nu n au .fu n D1 15 SHBBTS-HEET 11.

@num/tofu H. G. MILLER. BUTTONHOLB SEWING MACHINE.

APPLICATION FILED MR. 12, 1906. 1,006,583. Patented 0013.24, 1911.

I l5 BHEETSSHEET'IZ.

witnesses I www;

11-0. MILLER. I BUTTONHOLE SEWING MACHINE.

APPLICATION FILED MAB/.121 1906.

Patented 0013.24, 1911.

15 SHEETS-SHEET 1a.

H. c. naar witnesses H. C. MILLER.

BUTTONHOLB SEWING MACHINE. PPLIbA'rIoNTILBD'M-An. 12, 190s.

v Patented Oct. 24, 1911.

15 SHEETS-'SHEET 14.

H.. C. MULLERJl BUTTONHOLE SEWING MACHINE.

APPLIGATIONTILBD MAR.12, 190e.

Y 1,006,583.' A Patented 0G3,24, 1911.

15 SHEETS-SHEET 15.

15 machine after the stitching operation is over,

2C cutters the thread is severed soine'distance i end elevation looking from the head pt the h5 telildltl Til .HENRY C. MILLER, 0E WATERFORD, NEW YGPJK.

T Mn.,

BUTTOIIHLE-SEWING MACHINE.

y,@ipgge i Speciieaton of Letters Patent. Patented @ein 2da, Jll'illl.

Implication ledv March 12, 1906.. ASerial No. 305,593.V i

To all whom it may concern: slit in the lle it known that l, HENRY C. MILLER, a stitches. citizen ot the United States, residing vat Wa- `My invention also contemplates improvetertord, in the county ot Saratoga and State ments in the specific mechanism for yibratof Few York, have invented new and useful ing the need e, in that lt employ a series of o Improvements in Buttonhole-Sewing -Marevolving cams appropriately connected to cliines, ot which the following is aspecilicadle to .first .form v tying fabric in a plane between the tion. l

rlhi's invention relates to improvements in tl'iird the end-barring stitches; and fourth buttonhole sewing machines. v ln all buttonhole machines known to ine, l whereby to sever the thread.

the thread is .severedby a separate device, The invention also relates to improve after the 'cutting blade is operated, land-in ments in the specific details ci? construction, many instances the article is drawn from the l hereinafter referred to.

l ln the drawings: Figure 1 is a side eleva- 70 and-the thread is then severed; the length of l tion of my improved machine. Fig. 2 is a the waste thread being greater 'than is retop plan view. Fig. 3 is a bottom plan view.

Fig. l'is an end` elevation. Fig. 5 is a detail quired to stitch a complete buttonhole. y ill/ith other machines employing automatic face view of the fast pulley. Fig. 6 is an from the buttonhole, leaving a length ofl machine. Fig. 7 is a detail vertical section, thread which must be trimmed after the butillustrating the position of the upper and tonhole is completed. All such machines are lower threads, previous to the descent of the expensive, and 'thc operation extremely slow. cutting blade, the latter being shown in nor- .fi-.ccording to my present invention I emmal position in full lines, and down in dotted ge ploy essentially mechanism for feeding the lines; Fig. 8 is a vertical section on the material progressively to cooperate with the line 8`8 Fig. 3. Fig. 9 is a similar view, stitch forming mechanisi'n, in combination taken on the same line, but. showing the with specific means for vibrating the needle ,i vparts in different position. Fig. l() is a par- ?30 to relatively locate one or more stitches in] tial section -and side elevation of the right 85 the path ot the cutting blade, so that in the hand end of the machine. Fig. 11 is a detail orii'iation ot' the buttonhole slit, the thread view of a part ot' the stop motion. Fig. 12 is is also severed. a partial vertical section taken approxi- 'llhe invention also relates to improvemately on the line l2`12, Fig. 3. Fig. 13 is 5 ments iu the mechanism for drawing the a transverse section on the line ld-18, Fig. 9o

thread tor the next stitching' operation, at'ter 3. Fig. 14 is a similar view taken on the the preceding stitches are completed. line 14`1l, Fig. 3. F ig'. 15 is a detail perrihe feeding mechanism aslierein disclosed spectivc view of a part of the operating serves to perform a very importantfunction mechanism located under the machine. Fig. in connection with the stitching' operation, 16 is a detail perspective View of the feeding 95 in that the material being operated upon i mechanism, parts being-separated. Fig. 17 inust be moved Ain the prope path'to receive l is a detail perspective view of the time cam, the desired outline of stitches. .ln the presand its lever. Fig. 18 is a detail perspective cnt machine the material is not properly loview of a portion of the stop motion and its I5 cated atte the stitches are formed to permit operating lever. Fig. 19 is a det ail face View 100 oic the cutting blade descending and severing of a latchfor controlling the cutting blade. the thread in its path. lhereiore to return Fig. 2O is a detailv perspective view of said the fabric to its initial position for the cutparts separated. Figs. 21 and 22 are detail ting operation, l have provided manually perspective views of the connection vein- D operated mechanism for retairning the feedployed betwecnthe needle oar and the nest 105 ing mechanism and the material to initial ot cams. Fig. 23 is a detail lView of the nestl position. 'lhis movement ofthe feeding. of cams. Fig. 241s a section et the same.

mechanism places the stitches to be severed Fig. 25 is a detail view of a drum cam forv in the path of the cutting means to cause the operating the feeding device. Fig. 26 is a' l cutting blade to sever the thread and form a diagram of the cam groove in the drum cam. 'lio isan end view of the modification. Fig. 32b

is a side view. Fig. 32c is a detail perspective view of the modified form of cutting blade. Fig. 33 is an elevation view of the right hand end of the' machine, illustrating a means for -operatin the cutting blade before and after the stitching operation. Fig. 34 is a detail section of the same on line 34-34, Fig. 33. Fig. 35 is an elevation of a portion. of a sewing machine illustrating a niodification of my invention. Fig. 36 is a plan view of the modification shown in Fig. 35. Fig. 37 is a detail section onthe line 37 -37 Fig. 36, Fig. 38 is a detail plan view ofthe camsand the lever coperating therewith, shown in Fig.35.

The same numerals refer to like parts in all of the figures.

1, indicates a bed-plate of a buttonhole 'machine on which thevarlous mechanisms are-mounted; 2, the arm; and 3,the head. A shaft 4, is mounted in the arm, and it car` ries fast and loose'pulleys 5 and 6, and the bevel gears 7 and 8. The end of the shaft 4, coperates with the needle bar to impart the necessary reciprocating movement thereto, as will be 4readily understood.

A vertical shaft 9, is mounted in the upright portion of the arm 2, and has at its upper end a beveled pinion 10,`meshing with a beveled pinion 8, and at its lower end said 'shaft carries a pinion 11, meshing with a pinion 1,2, to impart motion to the lower stitch forming mechanism 13. On the shaft 9, nearthe'lower end` is a worm 14, whose threads are partially'spiral as at 15, and

' partially concentric as at 16. This worm is lthe means I employ for imparting the necessary intermittent movement to the feeding mechanism, and the co-acting mechanisln which vibrates the needle; the worm being constantly revolved during the stitching operation.

A shaft 18 under the bed 1, is mounted in a pivotal bearing 19,l andit bears a worm, gear 20 which meshes with the worm 14, while at the opposite end the said shaft'is provided with a worm 21. A pin 22, de-

.ibed plate,

ponds from the pivoted bearing beyond the worm gear, and to it is secured a spring 23, whose opposite end is fastened to a projection 24l depending from a sliding bar 153. The tension of the spring tends to draw the pin 22 and the end of the shaft down, and elevate the opposite end to disengage the worm 21, from its gear, for a purpose to be described.

Mounted in the bearings depending from .b'dfhis a shaft 26, having a worm gear 28.

and a ear 28,

and a time cam 30, fixed to the sha The cam 29, is formed with a groove 31, which starts at 32, at which point there is a slight dwell, then inclines therefrom to the point 33, where there is a dwell, from where it inclines at 34, to a dwelling point 35, Vand thence it inclines in an opposite direction, as at 36, to a point 37, where a short reversed portion 38 joins the point 32. Each portion of thel cam groove operates the feeding mechanism to move the' fabric during the stitching of a buttonhole, the slight dwells referred to coperatin with the groove to accomplish the desired result. When the lcam 29, is in its normal position as shown in- Fig. 9,

and the machine is -started, the intermittent movement from the worm 14, is not imparted to the feeder, until the dwell point 32 is past.

A slide 40, reciprocates in a slot 41, in the and it consists of an upper and under plate which lap the edges of the slot to form guides anti-friction rollers and balls 43, bearing againstthe walls of the slot, serve to reduce the friction. A projection 44 depends from the slide, and it is provided with a roller which fits in the cam groove31, by which means movement is virnparted to the slide as the cam is revolved. In ears 45 on the slide is pivotally mounted a tilting arm 46, carrying at A,its outer end a pair of yielding combined clamps and feeders 47. Each feeder is adjustably secured to the arm by set screws, and may be independently regulated. The opposite end of the tilting arm is bent upwardly and over, as at 48, and is formed with an opening 49, to receive the end of a pin 50. The lower end of the pin is seated in a cavity formed in an extension 51, of the slide 40, and is threaded to receive a nut 52, between which and the bent end 48, is a coiled spring 53.

A shaft 56, isv mounted over the tilting arm 46, and it has xed to it a projection 57, having a roller, adapted to bear on the arm 46, te rock it on its pivot and elevate the clamp feeders 47, for the release of the fabric, or the insertion of another piece. An arm 58, is fastened to the shaft 56, and is in the path of a lever arm 171, operated by a manually controlled lever 168.

\ The needle bar 62, recipr'ocates in a vibrat.

llO

'position r'llhe lower end of the rod 69, rests 'ings and an adjustable collar 107; said shaft 72, and formed with a, beveled gear 73, ,any pending application No. 262,401, tiled meshing with the beveled gear May 26, 1905, but in order that the opera' `he nest of cams as shown, consists of tion of the present invention may be un- :t'our individual cams 71, 71", 71c and 71", derstood' l will briefly describe it.. which coperate with the head 70. l he fast pulley 5, ie formed with a'sleeve 70 Rod 69, operates in suitable bearings, and 1120, on which the loose pulley 6, is mountis provided with a collar S0, against which ed, and on the hub of :Said fast pulley, and and the upper bearing is a coiled spring 81 ,s a hub of the arm 2, operates a grooved colto normally retain said rod in its lowcgst i lar 121, provided with a lug 122, and a dej pending arm 128, having an eye at its outer .75v on thc free end of `a lever 82, pivoted at 83, end. A ring 124, works loosely on the peto the bed 1, and it has a projection 811. j riphery'of the collar 121, and an arm ex- Projection 84, cooperates. with the time cam' tends from the ring, and is connected with 30. the latter vhaving. periphericalv surfaces l a second arm formed-with an opening to 87, 87a, 87h, 87e and 87d, each cooperating engage the sleeve .120, and an eye 125, with the nest of cams. vthrough which the power belt 126 passes.. On one side of arm 2, is mounted ashat't A pivotally mounted spring actuated ipawl 95, provided at one end with a bifurcated 6a is mounted on-the inner face of the ,fast arm 96, engaging a pin 97, projecting from,y pulley, and is normally inthe path of the a. bar 98, which .carries at its lower end a lug 122. On a shaft 128 mounted on thc cutting blade 99. Shaft 95, is adapted to be l bed, is a plate 129, which has a flanged end rocked by a cam groove 100, formed in the 130, to engage the edge of thering 1241, to tace ot' the loose pulley 6, in which is lomove'it in the operation of etopping and. cated an ejecting camv 101, the latter causstarting the machine. lhyielding belt. 131, ing lthe disengagement' of a projection 102, passes around the grooved periphery of the 90 on anarm 103, fast on shaft 95. The shaft :tast pulle ,and the ends of the belt are seis not only rocked, but is moved laterali cured by set screws to a lug on the plate toward and from the head 3, by a latch 104, 129. The belt also passes through the eye and when so moved, arm 6, travels on a I on the end of the depending arm 123, so

track or cam surface 105, to insure the prothat when the latter is rocked by the pawl 95 jection 102, remaining inA the cam Vgroove l 6a contacting with the lug 122, the belt will 100, after the latch 104, has been disenbecome tightened. An arm 125 is fast on gaged. the shaft 128, and engages -av lug on the A coiled spring-106, encircles the shaft j plate 129, and with the arm is a leverrlSG, 95, being located between one ot' the bearj having a chain 137, at its outer end, which 100- 1s connected with an 'operating treadlc 188. sprang serving to retain the shaft in its nor- A lever 139, extends from the plate 12S), mal position, and also to disengage projccand connected to it is va spring 140, which tion 102,irom its groove. The cam 101, is acts to draw 'the lever up arfl. throw the what may be termed a 'safely device to inparts to` stop the machine. lor eure the disengagement of the projection A link 141, connected to the rocking latch .102, from its cooperating cam groove. rlhe 104, has a loop at itel lower end through spring will accomplish this function under-'l which the lever 13* passes'. W'hen the maordinary circumstances, but with a high j chine is at rest, the link is drawn up by reaspoed machine, the rapidly revolving pulj son of the latch having been thrown out- 11o ley 6, is apt to carry the projection palet its ward'ly by the lug 112, hencev when the le` iscngaging point, hence I have found it j ver 139, is depressed to start the machine it expedient to use the cam 101. encounters the loop'and tilts the latch to rlhe latchrlOl, is pivotally mounted in a set it in operative.poeitionv for the'cutting rocking-frame 109, mounted on a stud 110, operation. 11 on the arm 2. Said latch cooperates with A latch 142, is pivotcd to thebed at 143, a projection 111, onshaft 95, to throw the and has formed with it a projection to catch cutter into operation, and oiiset fromv the over and hold the lever 139, in operative projection, is a lug 112, which-is in the path position, while the opposite end of sai d lever ,of the latch to disengage the latter from the 1s positioned in the path of a lug 144, on 12.0

projection when shaft 1s rocked to inthe drum cam 29.v At the proper time this sure of the cutter making but one stroke. .lug strikes the lever 142, and disengagcs the l `lever 114, attached to the rocking frame, lever 139, to auton'ialically stop the machine.

on the shaft 50, so that upon movement ot lisacurved arm 151,'whose f/ree end is formed 125 the shaft after the stitching operation-1s with a notch to engage 'the thread of they y over, the latch is moved to throw the cutter lower stitch forming mechanism, and

into operation.

spring 152 is employcdto hold the arm in he stopping and startmg mechanism 1s j its normal position. A sliding bar 153 e substantially the same as that described in mounted in bearings on the under-side f'th 130 befd, one end of said-rod beingpositioned ,opposite apin on the curved arm 151, as sown in Fig. 3, to engagethe same and turn the arm on its pivot to draw the-thread 5l slack for the starting of the next stitches.

Thesliding bar has attached to it a block 156, adjustable by means of screws and slots 157. fhe block has formed in it an inclined slot 158, to receive a sleeve in which is mounted a pin 159, projecting from a bearing on shaft 18, so that as the bar is moved the pin is caused to follow the slot and rock the shaft 18, in the tilting bearing to disengage the worm-21, from its gear 28. Just after this movement takes place, a finger 160, pivoted to the bar, and normally depressed therefrom by a light spring 161, engages a lug 162, on the drum cam, and slightly turns it, sufficiently .to cause the 2o' projection 44 to pass the inclined portion 38, of the groove 3l, to properly locate the auxiliary stitches under the knife, and position the feeder to start the next buttonhole. vSliding bar 153, is movedto cause the above mentioned operation by lan arm 163,

on an operating shaft 164, striking a projection 165, while the spring 23, serves to restore said bar to its normal position. When thebar is advanced, the tensionv of spring 23, is increased, and as'previously described, one end of it is fastened to a projection on y the rocking bearing, and assists the pin 159, and camfslot 158, in holding the worm.21, separated from its gear 28.

The shaft 164, has secured to it a lever 168, connected to a chain 169, attached to a pedal'170; also secured to shaft 164, is4 a lever arm 171, bearing a roller 172, which contacts with a cam arm 173, pivoted at 174, 40 and provided with a lever 175. The lever 175 is connected by a link 176, with the crank arm of a short shaft 177, mounted in bearings 178, on the head 3. Attached to the lower end of shaft 177, is a curved arm 179, the free end of which is positioned to draw the needle thread slack for the next operation. l

x When the shaft 164, lis rocked the lever arm 171 contacts with the arm 173 and rocks andl through the link connection, the curved arm179,is moved to accomplish its mission. The device for producing the slack threads being operated by the said shaft, 1 both threads are simultaneously drawn.

"W/hen the shaft 164, is rocked, the roller 172,;irst contacts with the cam arm 173, and then strikes the arm 58, and depresses the tilting arm 46, to raise the feeders 47, how-l ever, it will be noted that this operation does not take place until the other movements described-have been accomplished.

t 20p, indicates a 'tension device mounted on the arm 2, and comprising a pair of spring actuated beveled disks 201, between which the thread passes. A bell crank lever 202, is pivoted opposite the disks, the point of said lever being beveled and fits betweenl the disks, while to the free endv of said lever is connected a rod 205, secured at its opposite end to the lever 139. When the sewing mechanism is started the bell crank lever 202, is rocked onits pivot, and its beveled end is disengagedA from between the disks, so ,that when the thread is drawn out it is under tension, but when the stitching operation is over, and lever 139, is thrown'up to its normal position the disks are spread apart, and the thread is slackened, and the arm 17 9, draws the thread out to provide ample slack to start the next stitching operation.

The general operation is as follows: The

operator depresses treadle 138, and through the arm 135, the plate -129, is rocked on its pivot. The outer end of lever 136, being caught by the catch lever 142, and held until after the stitching operation is over when it is automatically released. When plate 129,

is rocked the head 130, moves the ring 124, and this in turn shifts the belt 126, from the loose to the fast pulley. As the ring 124, continues to move, it contacts with the collar 121, and moves the latter, to remove -the lug I 122, from the path of the pawl 6a. By the time the lug 122, is out of the way of the pawl, belt 126, is thrown onto the fast pulley,

The rapidly running fast pulley 5, throws pawl 6a outwardly against the tension of its spring, where it remains during the stitching operation. Power having been applied, shaft 4, through its connections in head 3, reciprocates the needle, whilel the gear 7, and its connection operates the vibrating nest of cams 71, and the gears 8, and 10, operate the lower stitch forming mechanism 13, and the feeding devices 47. Shaft 9, is

constantly revolved when the fast pulley is in motion, and by the connection between the worm 14, and worm gear 20, shaft 18, is intermittently revolved, hence the drum cam 29. lVhen the machine starts, the projection 44, is at the point 32, and the cam is intermittently revolved, the portions 31, feeding the fabric in direction of arrow a, (F ig. 2,) forming the tying. stitches A, and side purl stitches B, (I"ig.` 27). wWhen the dwell point 33, of camgroove 31, is reached the feeders remain stationary, and the end barring stitches C, are formed, and initiiediately after their completion, portion 34 of groove 31, reverses the intermittent movement of the feeders 47-47 in direction of arrow b, until dwell point 35, is reached, during which timethe opposite' side purl stitches l), are formed. At this period the feeders are again held stationary while the opposite ond barring` stitches F., are formed. These stitches having lbeen completed, the cam groove 31, again reverses the movement whereupon thepower is applied to op- .erate the stitching and feeding mechanisms.

of the feeders, in the direction of the arrow a, tokform the short auxiliary or -tying stitches li", after which the stitching mechanism is automaticallstopped by the lug 144, contacting with the lever 142; the projection 44, remaining at the point 37, as shown in dotted lines in F ig. 26. The timev cam 30, is intermittently revolved simultaneously with the drum cam, and the peripherical faces 87, 87a, 87h, and 87d, are arranged to act in conjunction with thel movement of the feeders. The cam 30, in its initial position is shown in Fig. 17, at which time the projection 84, is approximately between the cam surfaces 87d and 87a. AWhen the machinev is started, lcam 87, operating through connections 82 and 68, positions head 70, opposite cam 71a of nest- 71, to produce the tying stitches, and after these stitches are 2:0 completed and while the needle is in the fabric, the ends of cam 87a, operates through the connections to position head 70, opposite the cam 71d, which forms the` side purl stitches S.v Cain- 87a, is of such proportions as to hold head 70, in contact with. the cam 71d, until stitches B, are completed, then cam 87", operating through the connections switches head 70, opposite cam 71, to produce end barring stitches C, and cam 87C, 3o operates through the connectionsto switch head opposite the cam 71", to form the opposite side purl stitches D, then cam 87d positions head 70, opposite camV 71c to form rthe other end barring stitches E, then the projection $4, drops onto cam 87, to again position head opposite cam 71, to form the auxiliary stitches F, which are to be cut by the cutting blade. After these stitches are completed the adjustable lug 144, on the @o drum cam strikes the end of lever 142 and engages the lever 136 of the plate 129, and the spring' 130 immediately does not in the slightest cause a sudden j ar, and because of the proper timing of the parts the needle is stopped above the fabric.

' he buttonhole stitches are now completed, and it only remains to cut the slit X, sever 7e the threads F, and set the feed operating mechanism for the next operation. When the latch, to position it in a plane with the 75 lug 111, on shaft 95, as previously described, whereby the cutting blade can be manually thrown in to connection with the power mechanism.,

It will be remembered that when the stitching operation was completed the projection 44, wasnt the polnt 67, and it must ting bladenandf tolocate the feeders to worm 21, and its gear 28, must be separated.

e operator, therefore, draws down the lever 168, and rocks the shaft 164, causing arm 163, to contact with roller 165, which iirst rocks the shaft 18, on its pivotal the worm 21 and gear 28. ln the movement 95 of the bar 153,-its end strikes the curved arm 151, and draws the lower thread to provide slack lenough for the next stitching operation. Simultaneously with this movement roller 172, rocks lever 175, and through 109 the connection the upper curved arm 179, is turned to draw the upper thread to provide slack enough for the next successive' stitching operation. As the movement of the bar 153, is continued and after the worm and gear are disconnected, the fingerv 160,

i strikes the lug 162, on thedrum cam 29, and. turns it suiiiciently to position the progroove`30, which moves the feeders to prop- 110 erly position the stitches relative to the cutting blade. After the threads have been from the fast to the loose pulley, and simultaneously the friction belt 131, is tightened on the fast pulley to reduce the speed of the latter. The movement of the plate also on its pivot,.and the latch 104, forces the shaft 95, against the spring 106, and the project-ion 102, on arm 1103, is forced into the cam groove 100, in the. face of the loose pulley 6. Immediately the cam groove 100, rocks shaft 95, arm 96, travels on the cam 12,0 surface 105, insuring the engagement of the projection and cam groove, to complete the stroke of the cutting blade. When the shaft 95, Iis rocked, the lug 112, kicks the latch,A 104, out of the way, to insure of the cutting l blade making but one stroke, notwithstanding the operator is still holding down the lever 168.l When the loose pulley has made v one complete revolution, the' cutting blade 55 the pawl 6a. The friction of the belt 131, gradually reduces the speed of the pulley until the spring of the pawl 6", overcomes. the centrifugal force, and advances the point of said pawl toward the center of the shaft,

se whereupon. it encounters the lug 122, and rocks'the depending arm 123, and the friction belt is further tightened on the fest pulley, (see Fig. 4) land quickly brings the power shaft to astand-still. This stopping `'africains while absolutely. effective and sure,

1s forced down and drawn up again, where 13@ i 

